静脉滴注给药达到稳态血药浓度的99%所 需半衰期的个数为 （  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24975' and id < 2127561 and id<>'2127561' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24975' and id > 2127561 and id<>'2127561' order by id asc limit 5